C1.1.3 - Limitations Of The Particle Model Flashcards

1
Q

What are atoms?

A

The smallest particles that make up a substance

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2
Q

Which type of atoms are the smallest of all?

A

Helium atoms

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3
Q

What is the diameter of helium atoms?

A

62pm

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4
Q

Why is it difficult to draw particle diagrams of the gas state?

A

Because in reality they are so far apart

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5
Q

What are the forces between particles?

A

Attractive forces and electrostatic forces

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6
Q

What are attractive forces?

A

Electrostatic forces of attractions between positive and negative charges

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7
Q

What happens to the electrostatic forces when particles move further away from each other?

A

They become weaker

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8
Q

In which state is the electrostatic forces strongest?

A

Solid

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9
Q

In which state is the electrostatic forces weakest?

A

Gas

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10
Q

What are the limitations of the particle model?

A

The forces between particles
The size of particles
The space between particles

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11
Q

What happens to the volume of a substance when it melts?

A

It slightly increases

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12
Q

Why does the volume of a substance slightly increase when melting?

A

Some of the forces of attraction are overcome and the particles can move around each other

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13
Q

What happens to the volume of a liquid when it become a gas?

A

It increase greatly

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